Breast internal dose measurements in a physical thoracic phantom

Authors

  • Sabrina Donato da Silva Nuclear Engineering Department, Federal University of Minas Gerais, 31270-90, Belo Horizonte – Minas Gerais, Brazil
  • Márcio Alves de Oliveira Departament of Oncology, Clinics Hospital of Uberlândia, 38405-320, Uberlândia – Minas Gerais, Brazil
  • André Lima de Souza Castro Nuclear Engineering Department, Federal University of Minas Gerais, 31270-90, Belo Horizonte – Minas Gerais, Brazil
  • Humberto Galvão Dias Departament of Oncology, Clinics Hospital of Uberlândia, 38405-320, Uberlândia – Minas Gerais, Brazil
  • Luciana Batista Nogueira Anatomy and Imaging Department, Federal University of Minas Gerais, 30130-100, Belo Horizonte – Minas Gerais, Brazil
  • Tarcisio Passos Ribeiro de Campos Nuclear Engineering Department, Federal University of Minas Gerais, 31270-90, Belo Horizonte – Minas Gerais, Brazil

DOI:

https://doi.org/10.14808/sci.plena.2017.067501

Keywords:

Radiotherapy, Film Dosimetry, Thoracic Phantom

Abstract

Radiotherapy is a cancer treatment intended to deposit the entire prescribed dose homogeneously into a target volume in order to eliminate the tumor and to spare the surrounding healthy tissues. This paper aimed to provide a dosimetric comparison between the treatment planning system (TPS) ECLIPSE from Varian Medical Systems and the internal dosimetric measurements in a breast phantom. The methodology consisted in performing a 3D conformal radiotherapy planning with two tangential opposite parallel fields applied to the synthetic breast in a thoracic phantom. The irradiation was reproduced in the Varian Linear accelerator, model SL – 20 Precise, 6 MV energy. EBT2 Radiochromic films, placed into the glandular equivalent tissue of the breast, were used to measure the spatial dose distribution. The absorbed dose was compared to those values predicted by the treatment planning system; besides, the dosimetric uncertainties were analyzed.  The modal absorbed dose was in agreement with the prescribed value of 180 cGy, although few high dose points between 180 and 220 cGy were detected. The findings suggested a non-uniform dose distribution in the glandular tissue of the synthetic breast, similar to those found in the TPS, associated with the irregular anatomic breast shape and presence of inhomogeneities next to the thoracic wall generated by the low lung density.

Author Biographies

Sabrina Donato da Silva, Nuclear Engineering Department, Federal University of Minas Gerais, 31270-90, Belo Horizonte – Minas Gerais, Brazil

http://lattes.cnpq.br/4635866528275874

Márcio Alves de Oliveira, Departament of Oncology, Clinics Hospital of Uberlândia, 38405-320, Uberlândia – Minas Gerais, Brazil

http://lattes.cnpq.br/7720390948785258

André Lima de Souza Castro, Nuclear Engineering Department, Federal University of Minas Gerais, 31270-90, Belo Horizonte – Minas Gerais, Brazil

http://lattes.cnpq.br/8384062868383010

Humberto Galvão Dias, Departament of Oncology, Clinics Hospital of Uberlândia, 38405-320, Uberlândia – Minas Gerais, Brazil

http://lattes.cnpq.br/5694570254209521

Luciana Batista Nogueira, Anatomy and Imaging Department, Federal University of Minas Gerais, 30130-100, Belo Horizonte – Minas Gerais, Brazil

http://lattes.cnpq.br/3084251272040826

Tarcisio Passos Ribeiro de Campos, Nuclear Engineering Department, Federal University of Minas Gerais, 31270-90, Belo Horizonte – Minas Gerais, Brazil

http://lattes.cnpq.br/2004647037137301

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Published

2017-08-25

How to Cite

Silva, S. D. da, Oliveira, M. A. de, Castro, A. L. de S., Dias, H. G., Nogueira, L. B., & Campos, T. P. R. de. (2017). Breast internal dose measurements in a physical thoracic phantom. Scientia Plena, 13(6). https://doi.org/10.14808/sci.plena.2017.067501

Issue

Vol. 13 No. 6 (2017): June/Junho 2017

Section

Articles

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